Post-war anti-tank artillery. 57-mm anti-tank gun LB-3
The 57-mm anti-tank gun LB-3 was designed in the design bureau of the plant number 92. Her prototype was made in the second half of 46. LB-3 was supposed to replace the anti-tank gun ZIS-2.
The barrel LB-3 was manufactured as a monoblock with a two-chamber muzzle brake and screw breech. Vertical wedge valve, taken from ZIS-2 with almost no changes. Semiautomatic copying (mechanical) type.
Knuckle hydropneumatic. Rollback hydraulic brake. The lifting mechanism is a sector, rotary mechanism of the push type screw. There is a sector balancing mechanism and torsion suspension.
For direct fire shooting, the OP1-2 telescopic sight was used, there is also the possibility of placing a basket under the Hertz panorama. The chassis used wheels from GAZ-1 with a modified hub.
In October - November 46 of the year GAP conducted ground test 45-millimeter PTP LB-3. During the ground tests of the 1544 shots laid down, 866 shots were fired. At this test stopped due to poor extraction of the sleeves, which by the end of the test reached 50%.
Ballistic data LB-3, obtained during ground tests:
- The BR-271 armor-piercing projectile with a mass of 3,14 kg (charge mass of 1355 g) had an initial speed of 985 m / s, while the pressure in the barrel was 3162 kg / cm2;
- fragmentation projectile O-271U mass 3,75 kg (mass of charge 925 g) had an initial velocity 693 m / s, while the pressure in the bore was 1680 kg / cm2. The shot range at the angle of guidance 15 degrees was 6480 meters;
- the sub-caliber projectile BR-271P weighing 1,79 kg (charge mass 1685 g) had an initial velocity 1274 m / s, the pressure in the barrel bore was equal to 3082 kg / cm2.
The system, according to the conclusion of the test site commission, did not stand up, and for further testing, constructive improvements are needed. It was also noted that the large mass and large trunk pressure of the anti-tank gun LB-3 create on the battlefield much worse transportation conditions than the experienced C-15 and 4-26 systems. This conclusion can be regarded as a death sentence.
Thus, the ballistics of anti-tank guns LB-3 and ZIS-2 coincided.
Specifications light 57-mm anti-tank gun LB-3:
Sample - 92 plant;
Full length of the barrel - 4340 mm / 76 CL;
Channel length - 3950 mm / 69,3 CLB;
The length of the threaded part - 3420 mm;
The slope of the rifling - 30 klb .;
Volume of a chamber - 2,05 l;
The number of grooves - 24;
Cutting depth - 0,9 mm;
Cutting width - 5,45 mm;
Field width - 2,0 mm;
Shutter weight - 31,0 kg;
Barrel weight with bolt - 334 kg;
The angle of vertical guidance is from -9 ° to + 17 °;
The angle of horizontal guidance - 58 °;
The recoil length is normal - 960 — 965 mm;
Limit rollback length - 720 mm;
The height of the line of fire - 630 mm;
The length of the gun with shifted beds - 6250 mm;
The width of the gun when the beds are moved apart - mm 3860;
The width of the guns with shifted beds - 1660 mm;
Stroke width - 1500 mm;
Shield thickness - 7 mm;
Wheel diameter - 730 mm;
Weight of sliding parts - 382 kg;
The weight of the swinging part - 461 kg;
Shield weight - 65 kg;
The weight of the mast without a shield and guns - 406 kg;
The weight of the system in the combat position - 818 kg;
Rate of Fire - 15 — 25 shots per minute;
The speed of carriage on the highway - 45 km / h.
The barrel LB-3 was manufactured as a monoblock with a two-chamber muzzle brake and screw breech. Vertical wedge valve, taken from ZIS-2 with almost no changes. Semiautomatic copying (mechanical) type.
Knuckle hydropneumatic. Rollback hydraulic brake. The lifting mechanism is a sector, rotary mechanism of the push type screw. There is a sector balancing mechanism and torsion suspension.
For direct fire shooting, the OP1-2 telescopic sight was used, there is also the possibility of placing a basket under the Hertz panorama. The chassis used wheels from GAZ-1 with a modified hub.
In October - November 46 of the year GAP conducted ground test 45-millimeter PTP LB-3. During the ground tests of the 1544 shots laid down, 866 shots were fired. At this test stopped due to poor extraction of the sleeves, which by the end of the test reached 50%.
Ballistic data LB-3, obtained during ground tests:
- The BR-271 armor-piercing projectile with a mass of 3,14 kg (charge mass of 1355 g) had an initial speed of 985 m / s, while the pressure in the barrel was 3162 kg / cm2;
- fragmentation projectile O-271U mass 3,75 kg (mass of charge 925 g) had an initial velocity 693 m / s, while the pressure in the bore was 1680 kg / cm2. The shot range at the angle of guidance 15 degrees was 6480 meters;
- the sub-caliber projectile BR-271P weighing 1,79 kg (charge mass 1685 g) had an initial velocity 1274 m / s, the pressure in the barrel bore was equal to 3082 kg / cm2.
The system, according to the conclusion of the test site commission, did not stand up, and for further testing, constructive improvements are needed. It was also noted that the large mass and large trunk pressure of the anti-tank gun LB-3 create on the battlefield much worse transportation conditions than the experienced C-15 and 4-26 systems. This conclusion can be regarded as a death sentence.
Thus, the ballistics of anti-tank guns LB-3 and ZIS-2 coincided.
Specifications light 57-mm anti-tank gun LB-3:
Sample - 92 plant;
Full length of the barrel - 4340 mm / 76 CL;
Channel length - 3950 mm / 69,3 CLB;
The length of the threaded part - 3420 mm;
The slope of the rifling - 30 klb .;
Volume of a chamber - 2,05 l;
The number of grooves - 24;
Cutting depth - 0,9 mm;
Cutting width - 5,45 mm;
Field width - 2,0 mm;
Shutter weight - 31,0 kg;
Barrel weight with bolt - 334 kg;
The angle of vertical guidance is from -9 ° to + 17 °;
The angle of horizontal guidance - 58 °;
The recoil length is normal - 960 — 965 mm;
Limit rollback length - 720 mm;
The height of the line of fire - 630 mm;
The length of the gun with shifted beds - 6250 mm;
The width of the gun when the beds are moved apart - mm 3860;
The width of the guns with shifted beds - 1660 mm;
Stroke width - 1500 mm;
Shield thickness - 7 mm;
Wheel diameter - 730 mm;
Weight of sliding parts - 382 kg;
The weight of the swinging part - 461 kg;
Shield weight - 65 kg;
The weight of the mast without a shield and guns - 406 kg;
The weight of the system in the combat position - 818 kg;
Rate of Fire - 15 — 25 shots per minute;
The speed of carriage on the highway - 45 km / h.
Information